Megumi Kudou, Youji Motoki, Kana Inoue, Saori Tanaka, Hirofumi Miyaji, Masamitsu Kawanami, Tsutomu Sugaya. The Clinical Efficacy of an Ultrasonic Device with Built-In Electronic Apex Locator when Preparing Vertical Root Fracture Lines Through the Root Canal. dentistry. 2020. 10. 1